#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/acpi.h>
+#include <linux/freezer.h>
#include "tpm.h"
#define TPM_HEADER_SIZE 10
static LIST_HEAD(tis_chips);
static DEFINE_SPINLOCK(tis_lock);
-#ifdef CONFIG_ACPI
+#ifdef CONFIG_PNP
static int is_itpm(struct pnp_dev *dev)
{
struct acpi_device *acpi = pnp_acpi_device(dev);
return 0;
}
-#else
-static int is_itpm(struct pnp_dev *dev)
-{
- return 0;
-}
#endif
static int check_locality(struct tpm_chip *chip, int l)
static int request_locality(struct tpm_chip *chip, int l)
{
- unsigned long stop;
+ unsigned long stop, timeout;
long rc;
if (check_locality(chip, l) >= 0)
iowrite8(TPM_ACCESS_REQUEST_USE,
chip->vendor.iobase + TPM_ACCESS(l));
+ stop = jiffies + chip->vendor.timeout_a;
+
if (chip->vendor.irq) {
+again:
+ timeout = stop - jiffies;
+ if ((long)timeout <= 0)
+ return -1;
rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
(check_locality
(chip, l) >= 0),
- chip->vendor.timeout_a);
+ timeout);
if (rc > 0)
return l;
-
+ if (rc == -ERESTARTSYS && freezing(current)) {
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
} else {
/* wait for burstcount */
- stop = jiffies + chip->vendor.timeout_a;
do {
if (check_locality(chip, l) >= 0)
return l;
if ((status & mask) == mask)
return 0;
+ stop = jiffies + timeout;
+
if (chip->vendor.irq) {
+again:
+ timeout = stop - jiffies;
+ if ((long)timeout <= 0)
+ return -ETIME;
rc = wait_event_interruptible_timeout(*queue,
((tpm_tis_status
(chip) & mask) ==
mask), timeout);
if (rc > 0)
return 0;
+ if (rc == -ERESTARTSYS && freezing(current)) {
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
} else {
- stop = jiffies + timeout;
do {
msleep(TPM_TIMEOUT);
status = tpm_tis_status(chip);
* tpm.c can skip polling for the data to be available as the interrupt is
* waited for here
*/
-static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
{
int rc, status, burstcnt;
size_t count = 0;
- u32 ordinal;
if (request_locality(chip, 0) < 0)
return -EBUSY;
/* write last byte */
iowrite8(buf[count],
- chip->vendor.iobase +
- TPM_DATA_FIFO(chip->vendor.locality));
+ chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
status = tpm_tis_status(chip);
goto out_err;
}
+ return 0;
+
+out_err:
+ tpm_tis_ready(chip);
+ release_locality(chip, chip->vendor.locality, 0);
+ return rc;
+}
+
+/*
+ * If interrupts are used (signaled by an irq set in the vendor structure)
+ * tpm.c can skip polling for the data to be available as the interrupt is
+ * waited for here
+ */
+static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+{
+ int rc;
+ u32 ordinal;
+
+ rc = tpm_tis_send_data(chip, buf, len);
+ if (rc < 0)
+ return rc;
+
/* go and do it */
iowrite8(TPM_STS_GO,
chip->vendor.iobase + TPM_STS(chip->vendor.locality));
return rc;
}
+/*
+ * Early probing for iTPM with STS_DATA_EXPECT flaw.
+ * Try sending command without itpm flag set and if that
+ * fails, repeat with itpm flag set.
+ */
+static int probe_itpm(struct tpm_chip *chip)
+{
+ int rc = 0;
+ u8 cmd_getticks[] = {
+ 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
+ 0x00, 0x00, 0x00, 0xf1
+ };
+ size_t len = sizeof(cmd_getticks);
+ int rem_itpm = itpm;
+
+ itpm = 0;
+
+ rc = tpm_tis_send_data(chip, cmd_getticks, len);
+ if (rc == 0)
+ goto out;
+
+ tpm_tis_ready(chip);
+ release_locality(chip, chip->vendor.locality, 0);
+
+ itpm = 1;
+
+ rc = tpm_tis_send_data(chip, cmd_getticks, len);
+ if (rc == 0) {
+ dev_info(chip->dev, "Detected an iTPM.\n");
+ rc = 1;
+ } else
+ rc = -EFAULT;
+
+out:
+ itpm = rem_itpm;
+ tpm_tis_ready(chip);
+ release_locality(chip, chip->vendor.locality, 0);
+
+ return rc;
+}
+
static const struct file_operations tis_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
NULL);
static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
static struct attribute *tis_attrs[] = {
&dev_attr_pubek.attr,
&dev_attr_owned.attr,
&dev_attr_temp_deactivated.attr,
&dev_attr_caps.attr,
- &dev_attr_cancel.attr, NULL,
+ &dev_attr_cancel.attr,
+ &dev_attr_durations.attr,
+ &dev_attr_timeouts.attr, NULL,
};
static struct attribute_group tis_attr_grp = {
if (interrupt == 0)
return IRQ_NONE;
- chip->vendor.irq = irq;
+ chip->vendor.probed_irq = irq;
/* Clear interrupts handled with TPM_EOI */
iowrite32(interrupt,
resource_size_t len, unsigned int irq)
{
u32 vendor, intfcaps, intmask;
- int rc, i;
+ int rc, i, irq_s, irq_e;
struct tpm_chip *chip;
if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
"1.2 TPM (device-id 0x%X, rev-id %d)\n",
vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
+ if (!itpm) {
+ itpm = probe_itpm(chip);
+ if (itpm < 0) {
+ rc = -ENODEV;
+ goto out_err;
+ }
+ }
+
if (itpm)
dev_info(dev, "Intel iTPM workaround enabled\n");
if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
dev_dbg(dev, "\tData Avail Int Support\n");
+ /* get the timeouts before testing for irqs */
+ tpm_get_timeouts(chip);
+
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
init_waitqueue_head(&chip->vendor.int_queue);
if (interrupts)
chip->vendor.irq = irq;
if (interrupts && !chip->vendor.irq) {
- chip->vendor.irq =
+ irq_s =
ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
+ if (irq_s) {
+ irq_e = irq_s;
+ } else {
+ irq_s = 3;
+ irq_e = 15;
+ }
- for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
+ for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
iowrite8(i, chip->vendor.iobase +
- TPM_INT_VECTOR(chip->vendor.locality));
+ TPM_INT_VECTOR(chip->vendor.locality));
if (request_irq
(i, tis_int_probe, IRQF_SHARED,
chip->vendor.miscdev.name, chip) != 0) {
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
+ chip->vendor.probed_irq = 0;
+
/* Generate Interrupts */
tpm_gen_interrupt(chip);
+ chip->vendor.irq = chip->vendor.probed_irq;
+
+ /* free_irq will call into tis_int_probe;
+ clear all irqs we haven't seen while doing
+ tpm_gen_interrupt */
+ iowrite32(ioread32
+ (chip->vendor.iobase +
+ TPM_INT_STATUS(chip->vendor.locality)),
+ chip->vendor.iobase +
+ TPM_INT_STATUS(chip->vendor.locality));
+
/* Turn off */
iowrite32(intmask,
chip->vendor.iobase +
list_add(&chip->vendor.list, &tis_chips);
spin_unlock(&tis_lock);
- tpm_get_timeouts(chip);
tpm_continue_selftest(chip);
return 0;
tpm_remove_hardware(chip->dev);
return rc;
}
+
+static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
+{
+ u32 intmask;
+
+ /* reenable interrupts that device may have lost or
+ BIOS/firmware may have disabled */
+ iowrite8(chip->vendor.irq, chip->vendor.iobase +
+ TPM_INT_VECTOR(chip->vendor.locality));
+
+ intmask =
+ ioread32(chip->vendor.iobase +
+ TPM_INT_ENABLE(chip->vendor.locality));
+
+ intmask |= TPM_INTF_CMD_READY_INT
+ | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
+ | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
+
+ iowrite32(intmask,
+ chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
+}
+
+
#ifdef CONFIG_PNP
static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
const struct pnp_device_id *pnp_id)
struct tpm_chip *chip = pnp_get_drvdata(dev);
int ret;
+ if (chip->vendor.irq)
+ tpm_tis_reenable_interrupts(chip);
+
ret = tpm_pm_resume(&dev->dev);
if (!ret)
tpm_continue_selftest(chip);
static int tpm_tis_resume(struct platform_device *dev)
{
+ struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
+
+ if (chip->vendor.irq)
+ tpm_tis_reenable_interrupts(chip);
+
return tpm_pm_resume(&dev->dev);
}
static struct platform_driver tis_drv = {
git.openpandora.org / pandora-kernel.git / blobdiff